Packing-cup for pumps.



H. z. QOBB. PACKING CUP FOB PUMPS. APPLICATION Pimm JAN. 17, 191s.

' W/r/vEssEs 'IME/WOR;

' jemlyZL/o Patented 1m29, 1914.

Y closure.

UNiTED srArEs PATENT oFFifoE.

HENRY Z. COBB, F WINCHESTER, MASSACHUSETTS, ASSIGNOB T0. REVERE RUBBERCOMPANY, QF PROVIDENCE, RHODE ISLAND, A -CORPORATION OF RHODE ISLAND.

PACKING-cur Fou PUMPS.

Appiicaiion ined ianuary 17, isla. serial No. 742,534.

To aZZ whom it may concern Be it known that I, HENRY Z. Co, a citizen ofthe United States, ,residing ,in the f city of Winchester, county ofMiddlesex, and State of Massachusetts, have invented certain new anduseful Improvements in Packing-Cups for Pumps, ofv which the followingis a full, clear, and completedis- My invention relates particularly topacking used for pumps which are einyployed in pumping crude oil fromconsiderable depths, and which are required to stand the strain due toweight of the oil in the pumping tube at the various depths.

This requires a very rigid and strong cup 'f and one that will withstandthe wear due to high pressures on the sides thereof andy which will notfray or' become rough at the wearing points. l'

`Brieiy, my invention comprises a braided fabric in the form of va tubewhich is doubled upon itself to give a `selvage edge, the doubledportions being'l stitched together and they wholeimpregnated with rubberIor similar compound for the purpose of making the same homogeneous.

For a detailed description of one form ofmy invention, reference may behad to the following specification and toV thev accompanying drawingforming a part there- 4.

of, in which:

Figure l isa perspective view of one of the fabric rings for the packingcups, showing a portion thereof cut away to indicate the internalarrangement; Fig. 2 is a transl verse sectional view, showing a completecup; and Fig. 3 is a side View of a number of packing cups in positionon the pump Irod, and showing oneV of the said cups in cross section.

Referring to the drawing, the numeral l indicates the braided fabric forthe packing cup which is braided, in the first instance,

in the form of a cylindrical tube. lThis is then turned upon itself,forming the two parallel sides 2v and 3 which are stitched together bythe spiral stitching/1, so as to make a braided or selvage edge 5 at oneend of the ring thus formed. The cup is' then-molded after beingimpregnated with a suitable compound for making the cup homogeneous and'flexible, but quite hard and solid in its general character as .awhole.` The molding produces a bevelededge 6 at.

Specification of Letterslatent.

PatentedpD-ee. 29, 1914.

the outer edge of the cup, at which point is located the selvage orbraided edge 5 of the fabric. The opposite end of the fabric is turnedinward during the molding process'so that the cut or free ends of thefabric extend radially and abut against the pack# ing rod, as indicatedat 7 in Figs. 2 and 3.` The cups are mounted upon .a rod having` thespacing collars 8 which are provided with inclined surfaces 9 and areduced inner end 10 which engages the'internal flange 7 f of thepacking cups. These collars are tightly forced together so as 4to .holdthe i said flanged ends of the cup firmly in position, but the edges of.the cup'being slightly flexible allow the same toi expand tosufficiently engage the bearing/surfaces of the,

pumping tube.

It should be noted that .there is a slight space between the outsidesurfaces of the spacing collars 8 and the inside surfaces of the packingcups. This provides a recess into which the liquid may enter and expandthe cups into 'good wprking contact with the pump tube or casing. ltalso obviates dirt being retained on the working surfaces of the packingcup.

The advantageous featuresof the pack-v ing cup thus formed are that iteliminates all possibility of the cup opening or breaking at its sidesand edges, which breaking would, of course, destroythe action of thecup, as sometimes; j occurs in a case where similar cups are-'made ofwrapped, woven fabric. The method of doubling the fabric tube uponitself does away with the ragged edge at the workingend ofthe cup, whichis always present when the cup is made o f the wrapped, woven fabric.

construction also allows the different plies.4

ofthe fabric to separate. This is entirely prevented in applicantsconstruction. The v fact that the cup is made of braidedfabric 5' allowsthe threads of 'the fabric to extend on a bias or at an angle, an'dthereby enables bility at all times, without undue strain on the cup toretain vits full strength and flexithe threads, which would occur inthe'l i wrapped construction where the warpand filler runparallel withthe axis and cumferentially around the cup.

It is obvious that my improved pacl ';ingl cup may be' used inconnection with "other- 'types of pumps' than those for pumping. oiLI-V-ofimy in?` Having thus described 'for vention, what I claim and desireitof protect n rality of continuously or integrally con.-

nected layers. of tubular braided fabric,

doubled upon itself.

2. A packing device for pumprods, comprising a body portion made oftubular braided fabric which is doubled upon itself, forming a braidedor selvage edge at one end, the doubled portions being, secured togetherto form a unitary packing ring.

3. A packing device for pump rods, cornprising a body portion made oftubular braided fabric doubled upon itself, saaid device beingIimpregnated with a suitable homogeneous compound and formed with. aninternal retaining ange-at one end.

4. A packing device for pump rods, cornyprising a body portion made ofbraided fabric doubled upon itself, forming a selvage edge, said devicebeing impregnated with a suitable homogeneous compound and formed withan internalA retaining dange at the end opposite the selvage edge.

5. A packing device for pump rods, cornprising a braided fabric havingits threads extending helically, said fabric being doubled upon itselfto form a Woven edge, said doubled portions being stitched together, andsaid fabric being impregnated with a suitable compound and molded intoshape with an inturned retaining flange at the edge opposite said Wovenedge.

Signed this 17th da of December, 1912.

, HENRY Z. COBB.

Witnesses:

J. W. DUDGEON, E. L STICKNEY.

